Disable multiple date ranges jDateChooser

问题:

I want to disable multiple date ranges on a JCalendar. I'm following these steps, but I need to know how can I add multiple date evaluators. Help me please, thanks.

Update: I don't know why I can't disable the dates on my JCalendar. I will leave my code here so you guys can check it.

This is my RangeEvaluator class, modified from this class.

class RangeEvaluator implements IDateEvaluator {

    private DateUtil dateUtil = new DateUtil();

    @Override
    public boolean isSpecial(Date date) {
        return false;
    }

    @Override
    public Color getSpecialForegroundColor() {
        return null;
    }

    @Override
    public Color getSpecialBackroundColor() {
        return null;
    }

    @Override
    public String getSpecialTooltip() {
        return null;
    }
    @Override
    public boolean isInvalid(Date date) {
        return dateUtil.checkDate(date);
        // if the given date is in the range then is invalid
    }        

    /**
     * Sets the initial date in the range to be validated.
     * @param startDate 
     */
    public void setStartDate(Date startDate) {
        dateUtil.setMinSelectableDate(startDate);
    }

    /**
     * @return the initial date in the range to be validated.
     */
    public Date getStartDate() {
        return dateUtil.getMinSelectableDate();
    }

    /**
     * Sets the final date in the range to be validated.
     * @param endDate 
     */
    public void setEndDate(Date endDate) {
        dateUtil.setMaxSelectableDate(endDate);
    }

    /**
     * @return the final date in the range to be validated.
     */
    public Date getEndDate() {
        return dateUtil.getMaxSelectableDate();
    }        
    @Override
    public String getInvalidTooltip() {
        return null;
    }

    @Override
    public Color getInvalidBackroundColor() {
        return null;
    }

    @Override
    public Color getInvalidForegroundColor() {
        return null;
    }
}

Here is how I am using the RangeEvaluator class:

    RangeEvaluator evaluator = new RangeEvaluator();
    SimpleDateFormat dateFormat = new SimpleDateFormat("dd-mm-yyyy");
    evaluator.setStartDate(dateFormat.parse("11-09-2014"));
    evaluator.setEndDate(dateFormat.parse("15-09-2014"));
    jCalendar1.getDayChooser().addDateEvaluator(evaluator);

Am I missing something?. Help me please, Thanks.

回答1:

Based on your update there are two things that happen here.

First is a little mistake when you instatiate your SimpleDateFormat:

SimpleDateFormat dateFormat = new SimpleDateFormat("dd-mm-yyyy");

In this pattern "mm" refers to minutes not months. It should be:

SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");

Second problem is IMHO a bug since day chooser seems to not apply filters until a new date is set or it has to be repainted because of month/year change. You can test it changing month to August and then back to September: dates from 9/11 to 9/15 will be disabled. To solve this inconvenient behavior just set current date explicitely like this:

JCalendar calendar = new JCalendar();
calendar.getDayChooser().addDateEvaluator(evaluator);
calendar.setDate(Calendar.getInstance().getTime());

---

Side note: while this library is very very useful it has a couple of bug/design issues so don't hesitate to ask for help.

回答2:

Just call addDateEvaluator() for each RangeEvaluator that you create. This adds the RangeEvaluator to a List dateEvaluators inside JDayChooser. Later, JDayChooser iterates over the list when it decides how to draw the day buttons.

Edit: Here's the RangeEvaluator I used.

private static class RangeEvaluator extends MinMaxDateEvaluator {

    @Override
    public boolean isInvalid(Date date) {
        return !super.isInvalid(date);
    }
}

And here's how I used it.

RangeEvaluator re = new RangeEvaluator();
re.setMinSelectableDate(...);
re.setMaxSelectableDate(...);
JCalendar jc = new JCalendar();
jc.getDayChooser().addDateEvaluator(re);

One problem I noticed is that you have to tell the JDayChooser to reconfigure its buttons using the new evaluator. You can fire a property change event or just change a bound property.

jc.setCalendar(jc.getCalendar());